ML20086H594
| ML20086H594 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/20/1975 |
| From: | Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20086H592 | List: |
| References | |
| AO-75-53, NUDOCS 8401180057 | |
| Download: ML20086H594 (1) | |
Text
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PHILADELPHIA ELECTDIC COMPANY /
P a s C' T ' *. 9 - ?. t c r. f e Pover Stction y, -
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ir. J ane s P.
C'P.eilly, Director
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3tfice of Inspcction und Enforceuent
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'wAA United States Huclear Eegulatory Ccaniscion g gg-3 gh,q,4,%
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531 Park Aver.ue King of Prussia, Pennsylvania 19LO6
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Abrar c1 ?ceurrence ?'.-Hour _Sotificctics
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Jonfirning W.
T. U11 rich's p.. o t e Region 1. United States conversation with Mr. Walt Laucack, Nuclear Regulatory Connission on August
Reference:
License Nunber DPR-56 20, 1975.
Technical Specification
Reference:
k.T.D Report 5o.:
50-278-75-53 Report Date:
Aucuct 20, 1975 Ocetrrence rate: lu-set 20 1975
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Faci 1 Tty:
~ Peach Botten Atonic Power Station
.7. rw---l s-Tid te -Feran..cy15.Ani.n_.=-1731k_
r Identification of Occurrence:
' Failure of the "A" TIP nachine ball valve to close.
Conditions Prior to Occurrence:
Unit.3 at 555 power.
Description of Occurrence:
During routine operation of the TIP nachinen, step at the shield limit and close the the "A" detector failed to vithdrawn to the shield chamber.
ball valve as it was being Designation of Apparent Cadse of Occurrence:
The chield limit switch, which controls detector travel and operation, failed to operate when ball valve the detector reachei the 'in-shield' position.
This allowed was manually stopped.
the detector to continue its withdrawal until it Analysis of Occurrence: ~
switch to halt th withdrawal and close the ball The failure of the liuit valve was inmediately observed and corrected by node of operatica. and. stopping the nachine.
evitching to the canual by turning the nachine-off (de-energizeThe ability to close the ball valve and would have to close) has been verified been avaliable.if required.
Therefore, there are no safety implications to this occurrence.
Corrective Action:
j The detector was re-inserted past l
the withdrawal node of operation was initiated. shield chamber and the normal I
. functioned The shield limit switch correctly; the detector stopped, and the ball valve closed.
The. switch was tested several times in this manner.
Each test was f
successful.
The limit switch vill be inspected in an attenpt to deternine the cause of its spurious failure.
i Failure Data:
Previous failures of this type reported 50-278-75-31, 50-278-75-3L and 50-278-75-L2.
as Very truly yours,
./ Vke.WAW I
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T. Ullrich, S'uperintendent f
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0401100057 750829 4
PDR ADOCK 05000278 g
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